Combination hack and compass saw frame



April 1939- J. M. UP DE GRAFF 2,154,367

COMBINATION HACK AND COMPASS SAW FRAME Filed June 1'7, 1937 2 Sheets-Sheet l J: M Upfleraff 2 Sheets-Sheet 2 J. M. UP DE GRAFF COMBINATION HACK AND COMPASS SAW FRAME Filed June 17, 1937 A ril 11, 1939.

Patented Apr. 11, 1939 PATENT OFFICE COMBINATION HACK AND COMPASS SAW FRAMIE Joseph M. Up De Grail, Peoria, Ill. Application June 17, 1937, Serial No. 148,802

3 Claims.

This invention relates to an improved hack and compass saw frame intended to prevent the usual hack and compass saw blade from buckling and breaking in the work.

It has been customary to mount such blades in U-shaped frames with the blade secured at each end. The intermediate portion of the blade is unsupported so that it can easily bend, twist or buckle resulting in a possible broken blade.

The invention is intended to produce a frame wherein the greater portion of the blade is held against bending and buckling and where the frame is always engaging the blade close to the point at which the blade is actually cutting. This is accomplished by slidably mounting the blade in a slotted bar so that the bar can "constantly engage the work to form a guide for the blade as it reciprocates.

A further object of the invention is to provide means to continuously hold one end of the bar in engagement with the work.

Other objects and advantages of the invention will hereafter become more apparent from the specification of which the drawings form a part, and wherein:-

Figure 1 is a side elevational view of the invention;

Figure 2 is an enlarged fragmentary longitudinal vertical sectional view partly in elevation of the same; I

Figure 3 is an enlarged cross sectional view on the line 3-3 of Figure 1;

' Figure 4 is an enlarged cross sectional view on y the line 4-4 of Figure 1;

Figure 5 is an enlarged cross sectional view on the line 55 of Figure 1;

Figure 6 is an enlarged horizontal sectional view on the line 66 of Figure 1;

Figure 7 is an enlarged horizontal sectional view on the line'I-Jof Figure 1; and

Figure 8 is a fragmentary view in elevation partly broken away showing the recess in one end of the bar to receive the roller bearing.

Referring more particularly to the drawings wherein like reference characters designate like or corresponding parts in the different views, Ill designates generally the improved saw frame comprising a handle I I formed of the sections I2 and I3 secured together by means of a stud I4 and a screw I5. In the upper part of portion I2 is formed a bore IS in which is slidably mounted a bar I'I.

Secured to the top of handle II by a threaded bolt I8 is a knob or handle I9. Secured along one side of handle l I von a plane with bore I6 is a barrel 20 which is held in place by the screws 2! and 22. Barrel 20 houses coil spring 23 which has one end connected to screw 2| and the opposite end to a bracket 24 mounted on a threaded bolt 25 which engages an opening in end 26 of 5 bar Bar I1 is provided with an elongated slot 21 shaped to receive a saw blade 28 which is clamped at one end between the parts I2 and I3 of the handle II.

Secured to the end 29 of bar I1 is a collar 30 provided with a slot 3| in the bottom thereof to accommodate blade 28. Extending downwardly from collar 30 is a stop 3| adapted to bear against one side of the material to be cut.

Extending up from and formed integral with collar 3|! is a standard 32 provided with an offset portion 33 on which is mounted a knob 34 by means of a threaded bolt 35 which extends through into a threaded opening in portion 33. 20

Secured in the collar 3|] is a shaft 36 provided with a reduced threaded end 5|] to engage the internally threaded insert 5| mounted in opening 52 of collar 30. On shaft 36 is mounted a bearing 3'! which revolves in a recess 38 in standard 32 and in a recess 39 in the end 29. End 29 is also provided with an arcuate recess 40 to acc0mmodate a portion of shaft 36.

Bearing 31 extends down sufiiciently to engage the back edge of blade 28 as best seen in Figure 5 so that the blade 28 when in operation will ride on bearing 31 instead of binding against the top portion of slot 21 due to the pressure of blade 28 on the work.

Standard 32 is provided with a recess 4|, as best seen in Figure 7 in which is mounted a strip of thin steel 42 having one end bent at a right angle to form the portion 43. Also mounted in recess 4| is a wedge shaped clamp 44 provided at its larger end with a portion 45 extending at a right angle from the clamp portion 44. In the end of the portion 45 is a recess 46 to receive the shank of a threaded bolt 41 which engages a threaded opening 49 in the enlarged portion 48 extending from one side of the standard 32.

Strip 42 can be adjustably positioned in recess 4| and clamped by tightening bolt 41 to force the wedge 44 into a tight frictional engagement with strip 42 and with the sides of the recess 4|.

Collar 33 and end 29 are provided with aligned openings 53 to receive a pin 54 to key collar 30 to end 29 of bar IT to prevent collar 30 from sliding on bar II.

In operation, spring 23 and strip 42 are used alternatively. If the material is wide and thick strip 42 is removed and spring 23 is relied upon to hold the stop 3| and the end 29 of bar I? against the work. If the material is thin such as a sheet of metal to be sawed, the spring 23 is disconnected and strip 42 is positioned in the cut made by the blade with the turned end 43 bearing against the outer face of the material, to hold the inner face tight against stop 3| and end 29. Strip 42 is adjustable by means of the bolt 4'! as heretofore explained to adjust the strip 42 to material of different thicknesses.

As heretofore explained, end 29 of bar IT and stop 3| are held against the material by either the spring 22 or the strip 42, and the operator grips the handle H in his right hand and either the knobs l9 or 34 in his left hand, to operate the saw. By pushing forward on handle H, the blade 28 and the knob l9 carried by the handle I I, slide forward on bar I! which is slidably mounted in the bore it of the handle portion l2 to cause the exposed ends of blades 28 to out the material. As the handle is pulled back again bore l6 slides back over bar I! which is held stationary either by the spring 23 or the strip 42. Pin 54 prevents the collar 39 from sliding on bar ll when strip 42 is used. It can be seen therefore that the handle l l is mounted to reciprocate on bar Ill, and the blade 28 clamped in handle I l as best seen in Figure 3, is reciprocated in slot 21 of the bar I! to permit the exposed end of the blade 28 as it moves in and out of slot 21, to saw the material.

It is to be understood, that only the preferred embodiment of the invention has been shown and described, the right being reserved to make such changes and modifications as do not depart from the spirit and scope of the invention as claimed.

I claim as my invention:

1. A hack saw frame comprising a handle, a slotted bar slidably mounted therein, a blade secured in said handle and slidably mounted in said bar, a collar keyed to one end of said bar and having a stop formed integral therewith, and a metal strip adjustably mounted above said collar to extend through the cut in the work, the end r' of said strip being bent to engage the work to hold the collar in engagement therewith, the free end of the blade extending beyond said collar and bar to engage the work with the blade mounted to reciprocate in the slotted bar to saw the material.

2. A hack saw frame comprising a handle having a grip portion formed of connected sections and a bore arranged substantially at right angles thereto, a slotted bar slidably mounted in said bore, a blade clamped between the sections of the grip portion of said handle and slidably mounted in the slot of said bar, a collar mounted on the forward end of said bar and provided with a stop to engage one face of the material to be cut, a standard extending upwardly and rearwardly from said collar, a knob mounted on said standard forming a second grip portion, and a metal strip adjustably mounted in said standard above and in a plane with said blade and projecting forwardly to extend through the cut in the material, the end of said strip being bent to engage against said material, said blade extending beyond said bar to engage the work with the stop and strip holding the frame in engagement with the work.

3. A hack saw comprising a frame including a bar having a longitudinal slot, a handle having a transverse bore to slidably engage said bar, the grip of said handle having a removable section adapted to cooperate with a stationary section for clamping one end of a hack saw blade therein, said blade being slidably mounted in the slot of said bar with its opposite end extending beyond said bar to engage the material to be sawed; a standard secured to and projecting upwardly from said bar, said standard being provided with a slot, a strip slidably mounted in said last mentioned slot and having one end bent to form a stop, and a wedge member for adjustably clamping said strip in the slot, said strip extending through the cut in the material to dispose the stop on the far side thereof to retain the material in engagement with the bar.

JOSEPH M. UP DE GRAFF. 

